Server :: Kdump Doesn't Result In Dumps?
Feb 14, 2010
I have a dumb question but the google can't seem to answer it. When (if?) my host locks up (RHEL 5.4) I generally don't get anything in /var/crash . kdump is configured correctly and works (if tested using ` echo "c" > /proc/sysrq-trigger` as per Red Hat's KBase article) but in the real world, when the system locks up nothing ever ends up there.
So, on to the dump ( ) question - I have to crash it using Ctrl + SysRq in order to get anything out of this, right. If the box is comatose and doesn't respond at all to the point of being power cycled, it's all gone isn't it? Volatile memory being what it is and all; or is there some sort of magic / voodoo in place that makes it survive the reboot. And no, my Dell PowerEdge 1950 doesn't have battery backed RAM, so i'm quite sure that unless i can kill it through sysrq ...
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Aug 9, 2009
I just made a printer with help of system-config-printer and make the printer default.I assigned some print jobs to the printer. But my station on server1 doesn't dump jobs on the server1 which can be checked by the link Code:http://server1/printers/stationx How to make this happen ??
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Jul 3, 2010
I have an Ubuntu Linux on a VMWare running and I've installed RPM Package Manager. However when I try to query all packages using the rpm -qa command, I don't get any results returned.
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Jan 29, 2011
My Apache web server (respectively a child process) is crashing several times a day. I wanted to find the exact reason and activated the core dumps but even though the crashing-issues continue, the core dumps were never created. I have found several howto's which basically point to the same steps:
- set "ulimit -c unlimited"
- add "CoreDumpDirectory" directive into apache2.conf (Debian's httpd.conf)
Another info I've found is that /proc/sys/fs/suid_dumpable shouldn't be 0 - so on one howto it said to echo 2 into it, on another one to echo 1 to /proc/sys/fs/suid_dumpable - didn't work with neither of them.
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Dec 17, 2010
I want to search files (basically .cc files) in /xx folder and subfolders. Those files (*.cc files) must contain #include "header.h" AND x() function. Clearly, I wanna list of *.cc files that have 'header.h' & 'x()'. They must have two strings.
I tried several ways, and got only files with header.h OR x(). Some examples given in Internet doesn't give any result in my system. I am using Fedora 8.0 in my PC and I have grep 2.5.1 version.
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Oct 29, 2010
When I check socket on my box (Centos 5.5) I notice a strange behavior:
fuser 80/tcp
fuser -4 80/tcp
fuser -6 80/tcp
don't give me any result. But apache is running!
tcp 0 0 :::80 :::* LISTEN 25960/httpd
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Dec 19, 2009
When my server starts I received this text:No kdump kernel image found:[WARNING]Tried to locate /boot/vmlinuz-2.6.18-164.6.1.el5.centos.plusLoading kdump:[FAILED]
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Oct 25, 2010
Update kernel to 2.6.26, i don't know how to enable kdump for this kernel version.
at http://debuginfo.centos.org/5/x86_64/ not find kernel-debuginfo-2.6.26,
how to enable it ?
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Oct 7, 2010
I am wanting to create the smallest server I can possible. I have a small server I use as a print server and for file sharing. The hard drive is about 80GB. Since I only run cups and samba, I see no reason to take up an addition few GBs with major distros just to run the OS. I know it is possible to get a small distro around 50MB or so. I would even be happy with an OS running around 200MB. what would be the best way to go about doing this? LFS is just too complicated and time consuming for the end result. Would something like Gentoo be better? Anything else that I may not know about?
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Apr 27, 2010
I install centos 5.4 on my intel S5000vsa motherboard, and with embeded RAID1. I successfully config RAID1 in BIOS, and then I set to install centos use linux dd mode. And also successfully loaded raid drivers. In centos partition step, one disk appears. However, when centos installed and entered the system, strange result in fdisk -l.
fdisk -l
/dev/sda
...
/dev/sdb
...
Is it normal?
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Dec 7, 2010
I'm posting because I've read everything I can find on google and in the forum and the man page and still can't get it to work. I did read the FAQ, I hope I have adhered to it.I've tried several things and I don't remember exactly everything I tried and in what order.I've got several (12) HP ProLiant DL140 G3 servers running CentOS 5 that lockup about once a week. These are in a remote colo cage so I all i have access to is the built-in HP lights-out management interface, which includes a console, and ssh. I've been trying to get kdump setup to try to figure out what's going on. As an aside, if I run top on the console (via the management interface) the servers stay up for about a week, if I don't run top they crash within about 48 hours.I've used yum update to update to the latest available kernel (2.6.18-194.26.1.el5.x86_64) and installed the debuginfo and debuginfo-common RPMs from http://debuginfo.centos.org/5/x86_64/I have a single command in the /etc/kdump.conf file:ext3 /dev/sda5
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Mar 9, 2009
I would like to set up Kdump in case my machine crashes (and it still does frequently) to send the message to putty running on my windows machine (or to my other server running fedora 8).
My preference goes to the windows machine, but I have no clue how to set it up. Is it possible to get the "screen dump" on my windows putty?
My server crashes downloading torrents at high speeds (which is kind of what I want to do)
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Apr 23, 2016
I'm having some issues creating output from kdump-tools. (Initially to diagnose some system freezes when using wine, but now I can't a staged panic to work and provide proper output.)
I initially started following what is stated at this link: https://www.bentasker.co.uk/documentati ... ian-jessie
Where basically the author says:
Code: Select allapt-get install kdump-tools crash kexec-tools makedumpfile `uname -r`-dbg
to get all relevant tools.
Then in /etc/default/kdump-tools edit the following to :
Code: Select allUSE_KDUMP=1
in /etc/default/grub I edit the following line to the following :
Code: Select allGRUB_CMDLINE_LINUX_DEFAULT="quiet crashkernel=128M"
followed by update-grub. Then I get the pleasure of rebooting.
once I'm back in my system, I do the following.
Code: Select allecho 1 > /proc/sys/kernel/sysrq
echo c > /proc/sysrq-trigger
The system freezes, but does not dump any relevant information or reboot. It just hangs.
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Nov 11, 2010
I am trying to make a clean install of linux on three new 500G HDs. Because the last failure caused loss of my wife's pictures, I'm in the dog house. I know, I know. Back-up, back-up, back-up.I'm trying to set up a Raid 5 as partial insurance against disk failure (along with a frequent back up schedule). A friend suggested that I put 4-5 partitions in the raid array to aid in recovery if a disk fails (/boot, /, /var, /home, and swap). I know that swap doesn't get 'raided'. I've looked at 50+ tutorials on how to set up raid5 from a clean install and after installing the whole system. Nothing has helped or even addressed this issue so far.
Problem is that I have now tried installing 4 different flavors of linux (Ubuntu, Mint, and a couple of distros of Fedora) with the custom disk partitioning as mentioned above. I've tried installing grub on the MBR and the first partition (/boot). I've ensured that it pointed to the correct partition to find the kernel (/). I've tried everything that I can think of, and at every reboot, I get dumped to the grub CLI after bios post, regardless of distro. I cannot get the system to load the kernel.
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Apr 13, 2010
If anybody is having latest dumps of RHEL-5
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May 2, 2011
I'm running Scientific Linux 5.5 (equivalent to CentOS 5.5), and over the past two weeks, I have had a problem with my root partition filling up, preventing anyone from logging into the server.After searching for large files, and finding none, I was mystified when du told me that the root partition had only 660 MB of disk space used, whilst df showed it full. The problem was this: the /var/crash directory had been filled up by an 8GB crash file. Now, I'm a 'proper' sysadmin and make sure that /var has its own mount point, so the crash should not have touched the root partition at all. Except it did - instead of writing to /var/crash on /dev/mapper/VolGroup00-LogVol04 which is mounted as /var, it wrote the file to /dev/md0 directly, so when all the file systems were mounted, those files were hidden under the mounted /var.
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Aug 27, 2010
wher i wil find rhce dumps of new pattern.
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Nov 11, 2010
following the instructions on firefox's web site i installed firefox 3.6.12 in /home/jed/firefox. when i start it from KDE, it shows a startup feedback icon for a few seconds and a firefox button on the task bar for a few seconds, hen it dumps. when i try to start it from a terminal window, nothing happens, it just hangs. i let it sit like that for 20min before hitting ^C. i'm running slack 13.0. working version of firefox is 3.0.17, which fortunately i can point my KDE menu back to and get it to work.
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Feb 21, 2010
I recently noticed that I'm having bizarre results with my internet connection, specifically pertaining to APT. When I "sudo apt-get update" This is the result I get with ANY SERVER SELECTED. I tried the fastest server, one closer to me, a random one and the main server, they all yield the same result
Code:
Hit http://packages.medibuntu.org karmic Release.gpg
Ign http://packages.medibuntu.org karmic/free Translation-en_US
[code]....
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Jul 13, 2010
Have NO video camera. Trying to receive SKYPE video using Fedora 11 & SKYPE Beta Version 2.1.0.81 [latest version].When I receive a video call the image appears and then freezes and dumps the call after about six seconds.I have tried the 'env LD_PRELOAD=/usr/lib/libv4l/v4l2convert.so /usr/bin/skype' launch, but it makes no difference in the bug.I have NOT heard that a camera is required to receive video.Is there a fix for this?nal information: Here is the error message I get when the call dumps and crashes SKYPE.
[thsk@galley ~]$ env LD_PRELOAD=/usr/lib/libv4l/v4l2convert.so /usr/bin/skype
shm_open() failed: No such file or directory
Assertion 'b' failed at pulsecore/memblock.c:439, function pa_memblock_acquire(). Aborting.
[code]....
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May 8, 2011
I want to enable kernel crash dumps for my Debian 5.0.7 machine. The kernel version is 2.2.26 amd64.How can I configure this?
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Jan 29, 2011
I am running Windows 7 on an HP laptop trying to create a dual boot with Ubunta 9.0.4(?). I left 300 gb in unpartioned space when I loaded Windows 7 to load linux in (new hard drive). I then partioned the 300gb thru Windows using Paragon Hard Disk Manager. After installing Ubunta, it dumps me at the command prompt. Graphics problem?
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Apr 2, 2010
I am using Fedora 7 for making a server. I have installed Kaspersky mail gateway solution on that. but the solution is not working. I found an error in the message log file that is Mar 30 20:29:28 srfed kernel: mailgwd[2452]: segfault at 00000008 eip 084ed6a5 esp 003340d0 error 4 It means that the process for mail gateway dropped for some reason. I need to see the memory dumps and save them for future use.
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Jun 14, 2011
Has anyone noticed ABRT not being able to connect to Bugzilla or the remote Core Dump analysis server? Since my upgrade during the beta phase of F15 I have been unable to file bug reports from ABRT's traces, nor has it offered me the option to file bugs to bugzilla. What it does, however, is offer me to analyse the Core Dump and backtrace of the crash using either the remote server or locally with GDB. Needless to say I'm clueless in GDB, and it requires a LOT of debug symbols found in the corresponding debug packages. But trying to use the remote analysis server always results in a message of the server being busy and to try again later. IIRC the last time I was able to file a bug through ABRT was in 13, has anyone been able to do so in 15?
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Oct 12, 2009
I've had a Centos 5.3 zimbra mailserver set up for about 3 months now.Every 7-10 days or so, the system will do a kernel panic and I've been putting off its resolution due to other matters.I'm now ready to look into it but I have two issues :
1) No logs.
So far, I've manually rebooted when a kernel panic occured and could look at the panic printout and write down relevant info. But since I wanted more info than I had written down, I went hunting in the logs for the kernel panic event (one happened earlier today) but, to my surprise, I noticed the system doesn't log the kernel panic at all. Kdump is currently disabled as I'd like to keep all available memory available to the system but I was under the impression it would log the kernel panic message regardless but would simply leave out more advanced diagnostic information.How would I make sure the kernel panic is logged so I can have more info about it ?
2) The actual panic.Here's a snippet of what's appearing when the kernel panics :
EIP c0467136 page_remove_rmap+0x66/0xc0 SS:ESP 0068:c3ca6ddc <0> Kernel panic - not syncing: Fatal Exception
I've also seen f793bee4 instead of the highlighted part above but everything else is always the same from the times I've seen (as I haven't always had the chance to be around when a panic occured).I'm looking further into it at this point but early research seem to indicate this could be a memory issue. I'll run memtest next weekend to check that out (since I don't want to take the system offline for any length of time during office hours) but people here might have other theories based on what I've put up so far. The system has all of the latest patches and updates and is running only what I need as far as software goes (zimbra server + prerequisites, x + GNOME (not loaded on startup), firefox and vnc for windows RDP access). My system also uses a software RAID1 array (boot = md0 and / = md2 with swap files not being mirrored as there's no need to).
PS : In order to further troublehsoot by myself before posting here, I've tried to enable kdump to see if kdump is the culprit for the missing logs but I'm also having an issue with it. I'm getting a "No kdump initial ramdisk found" and "mkdumprd: failed to make kdump initrd" messages at startup. I'm thinking this might be because of my raid array ? I've found an old bug report regarding one of those error messages on centos 5.2 but it was supposedly fixed in the 30 version by RH and I'm using the latest one (56).
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Aug 28, 2009
Is there something that blocks cron from running a shutdown command? I'm doing a daily bounce to break an attack (I have thread about that in security forum), but I always end up doing it manually. The cron log shows it being fired off at the right time...but the server never bounces. I thought maybe I just missed it, but there is nothing in messages that shows the server restarting (unlike when i do it manually, you see the start-up logging).
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Jun 22, 2010
Is it possible to somehow setup an ssh server that doesn't require a username,password or cert to login?I wish to provide shell access to a console program, which will prompt for a username and password.Encryption is essential though, and users must not be able to snoop in on each other
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Jun 1, 2009
I have just configured CentOS server my new office. This is the first time I am using CentOS.
Whenever I am trying to change the webroot of the httpd server, it usually say "directory doesn't exist". whereas which can't be the case as it is home directory of the user.
To achieve this, what Do I need to do?
The second issue, I am facing that whenever I am adding new directories to public_html folder, it is not accessible. as the error page 404 is shown. I have changed the permissions to 0705 and ownership is also transferred to other user. What else is required to make new directories accessible by the web?
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Oct 23, 2010
I'm trying hard to run an openvpn server on a openvz VPS, the problem is packets sent from openvpn server process, doesnt reach the client, so connection is never stablished (I run tcpdump on server and wireshark on client to carefully investigate whats wrong), the first guess is that a kind of firewall is blocking traffic (I tried connecting to server through different ISP's but it's possible the national network provider applied some filtering but it cant be on IP,src port or dst port as I'd tried different configuration.
what about deep packet inspection technics, is it possible to block my traffic?) but at exactly the same time I can transmit UDP packets using netcat from server to the guest. there is no firewall enabled in between, I had tried, tcp and udp, tried both open vpn and openvpnAS and tried any thing one can imagine! the VPN is configured as a routed (TUN) type on debian
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Sep 6, 2010
I have used Dump Command to dump the application files. For Full backup the level 0 is working fine. For incremental backup I used the level 1 or 2 it is getting the error as
DUMP: Only level 0 dumps are allowed on a subdirectory
DUMP: The ENTIRE dump is aborted.
The code I used
===============================
#!/bin/bash
#Full Day Backup Script
#application folders backup
#test is the username
now=$(date +"%d-%m-%Y")
[Code]...
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